pia(redirected from PIO)
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The pia mater.
1. (Anatomy) anatomy the innermost of the three membranes that cover the brain and the spinal cord
2. (Plants) a herb from East India which has an edible root that produces arrowroot starch
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|Noun||1.||pia - perennial herb of East Indies to Polynesia and Australia; cultivated for its large edible root yielding Otaheite arrowroot starch|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests